Roof Slope Ratio Chart

Let s say it is equal to 1 5 m. Once you ve figured out the pitch of your roof you can consult the following chart to discover the slope factor and hip valley factor. Calculate the roof pitch as the proportion of rise and run.

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Pitch rise run 1 5 6 25.

Roof slope ratio chart.

A ratio of 1 1 62 is known as the golden ratio and therefore the vast majority of roof pitch in degrees charts you see will be working to this ratio at the very least. Calculate the rafter length substituting these values into the following formula. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Notes to the table above. Some sources consider low slope to include 3 12 pitch roofs. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials.

This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Download the slope chart pdf. Low slope roofs are from 0 to 3 12 in pitch. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Measure the rise of your roof. Valley hip factor.

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